The wartime anime film "Cocoon: One Summer of Girlhood" will debut in North American theaters on Sept. 4, 2026 [1].

The release marks the first time English-speaking audiences can experience the film in a theatrical setting. By providing both subtitled and dubbed versions, the distributor aims to broaden the reach of the story across the U.S. and Canada [2].

Directed by Yukimitsu Ina, the film is based on a manga by Machiko Kyo and was animated by studio SASAYURI [1]. The story follows a narrative set during wartime, focusing on themes of girlhood and survival. The official English-subtitle trailer was released earlier this year [3].

GKIDS will handle the North American distribution of the project [1]. The company said it is bringing the film to the region to expand its current catalog of international animation and introduce the specific wartime narrative to a wider audience [2].

While the North American debut is scheduled for this September, the film previously premiered in Japan in March 2025 [4]. The transition from its original Japanese release to the North American market follows a standard distribution timeline for high-profile anime features.

The film's visual style emphasizes the contrast between tranquil environments and the harsh realities of conflict. Promotional materials highlight scenes of a warm island school and the clandestine efforts of characters San and Maye, who nurse the wounded in a hidden cave hospital [5].

“The film will open in North American theaters on September 4, 2026”

The acquisition of 'Cocoon: One Summer of Girlhood' by GKIDS signals a continued market appetite for adult-oriented, historical anime in North America. By opting for a dual-format release (subbed and dubbed), the distributor is targeting both the core anime enthusiast base and general cinema-goers, reflecting a broader trend of anime moving from niche streaming audiences into mainstream theatrical exhibition.